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Two Respiratory Diseases Common
to Ducks
There are different common diseases that affect the respiratory system
of ducks. However, with modern systems of management, and the proper
observation of the signs and symptoms, one can easily avoid the spread
of these diseases.
FOWL POX
Ducks of all ages and breed are susceptible to duck pox. There are two
forms of duck pox. The dry form is distinguished by raised, wart-like
bruises on the skin devoid of feathers. The bruises commonly heal in
about two weeks. If the bruises are removed before total rejuvenation,
the surface beneath would be rare and bleeding. Retarded growth is the
usual symptoms of duck pox. In duck hens, infection results in a
temporary waning of egg production.
The other form is the wet form. In this type, blight-like lesions near
the bill can be observed. This can cause a respiratory distress by
blocking the upper air pathways. A duck may be affected with either
form at the same time.
Fowl pox can be transmitted through direct contact between infected and
vulnerable birds or by carriers such as mosquitoes. Virus-carrying
lesions also can be transmitted from infected birds and serve as a
source of contamination. The virus can invade the bloodstream through
the body openings such as eyes, ears and skin wounds, or respiratory
passages.
There are some evidences that the mosquito remains infective over time.
These insects are the primary carriers of the fowl pox on the ducks.
Several species of mosquitoes can transmit fowl pox. Often mosquitoes
winter-over in duck pens, and widespread contamination can happen
during the cold season and early spring.
There is no known treatment for fowl pox. However, it is quite
slow-infecting. Hence, it is possible to administer vaccination to stop
a wide contamination. The wing-web vaccination treatment is normally
administered and the thigh-stick technique is used for ducks older than
2 months.
Fowl pox in ducks confined in pens can be prevented by using a mosquito
repellant spray. However, if the disease is endemic, that is common, in
the area, a vaccination is suggested. Never vaccinate unless the
disease is a wide problem in a large farm or in the area.
NEWCASTLE DISEASE
The Newcastle disease is also known as pneumoencephalitis. The
viscerotropic type is a highly contagious and fatal form of this
disease. This disease can affect all ages of ducks. Humans and other
mammals are also vulnerable to this disease, but in form of mild
conjunctivitis.
Basically, there are three forms of this disease: lentogenic,
mesogenic, and velogenic. This disease is distinguished by an immediate
onset of symptoms that includes hoarse quaking, mucus discharge from
the nose, difficulty in breathing, inflammation if the face,
immobility, trembling and involuntary twisting of the neck (as a sign
of invasion in the central nervous system, where motion impulses are
sent from the brain and vice versa). Fatal incidences vary from 10 to
80 percent based on the severity of infection.
In mature duck layers, signs and symptoms can include lower food and
water consumption and a significant reduction of egg laying. This
disease can be transmitted by direct contact or by airborne ways.
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